Film processing computer



Jan. 14, 1964 s R. BuGELHoLl.

FILM PROCESSING COMPUTER Filed Aug. 4, 1961 5 Sheets-Sheet 1 FEE NORM/76 focessM/s was n JNVENTOR 'L 1 a' SMA/Y a @aan ,you

L/MQd Jan. 14, 1964 S. R. BUGELHOLL FILM PROCESSING COMPUTER Filed Aug. 4, 1961 N35 lo DEVE are# Iva-2 I' com caarmfsr /7-9 PROCESS/IVG HCH/IVE FEET ff. M//YUT' PROC ISS/N6 T//V IN MINUTES 4S 50 n maven/'NB 5 Sheets-Sheet 2 BY Mw,

Jan. 14, 1964 s. R. BUGELHOLL FILM PROCESSING COMPUTER 5 Sheets-Sheet .'5

Filed Aug. 4, 1961 Davao/6R No.2 \19 INVENTOR. SID/VD )E BUG'L//OU HIGH CONT/PHST Jan. 14, 1964 s. R. BUGELHOLL Erm PROCESSING COMPUTER 5 Sheets-Sheet 4 Filed Aug. 4. 1961 'nun' ,q Trai/vf 5 Jan. 14, 1964 s. R. BUGELHoLL 3,117,722

FILM PROCESSING COMPUTER Filed Aug. 4, 1961 5 Sheets-Sheet 5 DEVE! OPEP N0. MED- C 0N TRIIST INVENToR. sum/fr e. susa #ou United States Patent O 3,l1i,722 FILM PRESSING CQMPUTER Sidney R. Bugelhoil, Lake View Terrace, Calif. Filed Aug. 4, 1951, Ser. No. 129,485 Claims. (Cl. 23S-64.7) (Granted under ritle 35 US. Code (i952), sec. 266) The invention described herein may be manufactured and used by or for the United States Government for governmental purposes Without the payment to me of any royalty thereon.

This invention relates to calculating devices or computers and more particularly to a calculator of the manually settable type for use as an aid for processing exposed photographic strips of film by the well known rewind method on BSa and B6 Developing Machines, or by the continuous processing method, including settable means for calculating or indicating the processing conditions for a predetermined percentage of intentional overdevelopment or underdevelopment.

A further object of the invention is the provision of a simple, accurate, and easily manipulatable strip ilm development or processing calculator for exposed photographic iilms having different types of emulsions for determining film processing procedure with different types of developer' on different classes of film, and at diilerent developing temperatures, taking into account ditierent kinds of emulsions and diiierent photographic and development conditions or requirements,

A further object is the provision of a simple, easy to handle and read, calculator for lilms of diilerent predetermined lengths for determining the processing times for variations in temperature conditions and variations in the types of film emulsions.

Another object is the provision of a simple, accurate and easily manipulatable and readable development calculator for iilms and photographic emulsions for use with processing machines for automatic lilm development for determining the rates of movement of the film or emulsion through a variety of different predetermined developers for different predetermined variations in the contrast in the exposures, in combination with diierent types of photographic emulsions, a further object being the inclusion of means for calculating the desired processing speed for the film per minute through a selected predetermined developer.

A still further object is the provision of a film development calculator having adjustable indicating means for determining predetermined distances of travel of a film in the development solution, and correlated processing time indicating indicia in minutes, which are manually adjustable for operative registration with each other, having cooperative indicia settahle thereby for indicating the rate of advance of the lm through the developer for the proper development thereof.

Another object is the provision of a manually operable calculator for indicating the film processing speed through a developer for developing the film, including means for indicating the desired rate of movement for a predetermined variety of types of developer, different classes of nlm, and predetermined variations in the temperature of the developer.

A further object is the provision of a manually manipulatable calculator having a pair of spaced front and back indicia carrying panels formed with windows therethrough for selectively displaying corresponding correlated film developing and processing data therethrough, indicating a plurality of different types of developers required for different photographic conditions under which the photographic negatives were exposed and the corresponding processing time for such developers for a plurality of diierent classes of photographic emulsions, at a 3,117,722 Patented Jan. 14, 1964 plurality of different development temperatures, a further object being the inclusion of manually adjustable means thereon having cooperative indicia between one of the panel members and the last mentioned adjustable means for accurately determining predetermined variations in the development process for intentional predetermined percentages of overdevelopment and underdevelopment.

Other objects and advantages of the invention will become apparent from the following description and accompanying drawing in which like reference characters refer to like parts in the several figures.

FIG. 1 is a plan view of one face of my improved Film Processing Computer;

FiG. 2 is a similar view of the rear or opposite face of the computer, for use with automatic processing machines such as the well known A-9 processing machine;

FiG. 3 is a plan View of the temperature indicating pivotal quadrant or segment which is disposed directly under the front face or panel, as shown in FIG. l;

FlG. 4 is a plan view of the main processing time in minutes indicia disk for showing types of developer and processing time indiciurn, which cooperate with the temperature and class of film indicia on the front panel and on the length of lm and temperature indicating indicia segment shown in FIG. 3; and

FIG. 4A is a fragment or portion of the disk shown in FIG. 4, more clearly disclosing the time indicating indicia in detail for one of the developer and contrast conditions; and

FIG. 5 is a plan View of the reverse side of the main disk shown in FlG. 4, which is provided also with indicia indicating types of developers for different contrast conditions oi iilm, for selective registration in Windows in the rear panel with indicia for indicating the required processng speeds tor different classes of iilm, at different predetermined temperatures, the disk face also containing cooperating indicia for determining iilm movement in minutes for the predetermined distances of film travels in any selected developer.

Referring to the drawing, particularly FIG. 1, the reference numeral 1 denotes one face, hereinafter referred to also as the front side or front panel of the improved lm processing computer, this face having an indicia scale across its top or upper end in the form of a footage scale 2, denoting the approximate length of the lm being de- Veloped or processed.

Located directly below the footage scale 2, just referred to, is a segmental shaped window opening 3 for exposing temperature and lm classification data for at least three different classes of lm emulsions, classes L, N and K indicated by wide bands 4, 5 and 6.

Directly below or under the comparatively large segmental window 3 is a smaller, also segmental, window opening 7 for displaying selective different types of developer for dilierent types or degrees of contrast in the iilm or photographic subject matter.

Located immediately in back of the front panel 1 and pivoted to the front panel at 8 is a large manually swingable segment or quadrant member 9 which is provided with a radially disposed manipulating tab or handle member 10 which projects beyond the top of the panel 1, having a hair line 10 for registration with the indicia of the lm length footage scale 2, for making selective adjustments of the angular position of the member 9.

The segmental member 9 is formed with a radially extending window opening or slit 11 disposed in radial alignment with the hair line 10 and the pivot point 8. for simultaneous display of 'three groups 12a, 12b and 12C, of film processing time indicating indicia in minutes disposed on a main adjustable disk member 12.

The groups 12a, 12b and 12a, extend concentrically on the disk around the pivot 8, one group or ring of processi# ing time indicia 12a is disposed for registration with the arrows la on the segmental member or plate el and class L temperature indicia lla.

A second circular group 12b of processing time indicating indicia is provided for registration with the intermediate arrow a and the class N temperature indicia ila adjacent the window opening or slit ll for the group 12b, While a third group i220 of time indicia is provided in the groups for registration with the temperature indications relating to the class l lms, as indicated by the arrows 6a.

The adjustable segment or quadrant member 9, as seen in FlG. 3, is provided with a relatively wide segmental window adjacent and concentric to the pivot S, indicated at 13, for displaying the type of developer indicating indicia on the face of the main disk l2 therethrough.

Located on the lower portion of the iront panel l, below the pivot 8 and segmental or quadrant member 9 is an over-and-underdevelopment calculatorcomprising a smaller indicia carrying disk ldiwhich is pivoted to the front panel l at l5 and comprises a development time in minutes indicating indicia scale lo disposed around its periphery which is graduated progressively clockwise from 5 minutes to 90 minutes. This scale lo is disposed to register with a percentage of overdevelopment time indicating indicia 17 around one side of the disk, preferably the left side, and a percentage of underdcvelopment time indicating indicia scale l at the opposite or right side of the disk ld, as seen in FlG. l, also for selective registration with the development time indicating scale or indicia 16.

The scale 17 is provided with a zero percentage or normal processing time indicating arrow 17a at the beginning of the overtime percentage indicating scale E7, and a similar normal processing time arrow l is provided on the panel l at the beginning of the desired percentage of underdevelopment indicating scale l.

The large disk l2 is also provided with a plurality of types or kinds of developer indicating indicia or legends 19 which are correlated to the developing time in minutes indicia rings of the groups 12a, lZb and llc. These rings 12a, 12b and 12C of radially disposed columns of indicia are disposed to be oriented in back of quadrant 9 for selective display through the window 3 in the front panel 1 and window ll, according to the developer legend and selected length in feet of the processed film, as determined from the footage scale 2, for all swinging or angular adjustments of the quadrant or segment member 9.

The window 13 in the quadrant 9 is suniciently wide to permit the type of developer and contrast indicating legends to remain visible through the window '7 for all swinging adjustments of the segment 9, so as to expose to View through the radial window lll the proper correlated developing or processing time indicating indicia in the groups 12a, Hb and lZC. Therefore the segmental window opening 3 is also sufficiently wide to selectively expose to view any one of the radial columns in the groups of time in minutes indicating indicia 12a, 12b and l2@ which relate to the developer and legend which is displayed through the small segment window 7 in the iront panel 1, any one column thereof being exposed, depending upon the angular adjustment of the segment member 9 for the number of feet indicated on the footage scale 2.

The different types of developers and contrast variations 19, as shown in FIG. 4 are eight in number, and indicated at 19a, 19h, 19C, ll9d, we, l9f, 19g and i911, respectively, for Developer No. 2 High Contrast; Developer No. 3 Low Contrast; Developer No. 3 Medium Contrast; Developer No. l Medium Contrast; Developer No. l High Contrast; Developer No. l Maximum Contrast; Developer No. 2 Low Contrast; and Developer No. 2 Medium Contrast.

By rotating the large or main disk l2, any one of the developer and contrast conditions indicating indicium can be brought into the window 7. Of course, only one of the radial columns of the developing time in minutes l indicia can be viewed at one time through the window ll in the pivoted segment 9 which relates to the selected developer and the indicated length or footage of the ilm on the scale 2.

The black circular concentric rings Ztl divide the processing time in minutes into the three groups 12a, 12b and l2 for better separation and alignment with the respective arrows da, 5a and da, and for determining the separation of the groups of temperature reading indicia lla at the opposite sides of the window li for the difierent Class L, Class N, and Class K) lrns.

ln using the iilm processing computer, as above dcscribed for the required contrast group for iim processing in connection with the 35a and B6 lm processing machines it is rst necessary to select the desired developer Qa for the indicated contrast group. This is accomplished by rotating the large main disk l2 by the portion thereof projecting out beyond the sides of the panel l to bring the indicia indicating the selected developer (i9a as seen in FIG. l) into proper register in the window 7 in the panel ll.

The tab member lll must be adjusted manually to dispose the hair line lll on the proper indicia 2, indicating the approximate length of the nlm to be processed; for instance, an approximate length ol 25 0 tt. as seen in PEG. l.

This positions the window ll in the segment 9 in the correct position to expose to view the correct radial column of processing time in minutes indicating indicia for the three groups i223 lill and i2@ on the main disk l2 (after the disk l2 is adjusted for developer and contrast conditions).

The class of film to be processed is selected by the arrows 45a: Sa and 6a; for instance, selecting the Class L lilm, as indicated at il in FlG. l leads to the arrow 4a, which in turn points to the portion of the group lila of processing time in minutes indicating indicia exposed through the slot window ill in the segment 9.

The selection of the temperature of the developer on the temperature indicating indicia scale lla alongside of the window must be made for the selected arrow; for instance, if the indicia lla, indicating a developer temperature of 70 F. is selected on the temperature scale opposite the Class L arrow, the processing time in minutes is directly indicated in the window ll as 27%r minutes.

Sometimes it is desired to purposely overdevelop or to purposely underdevelop the nlm by a predetermined percentage, and for this purpose the smaller disk on the face of the panel l, indicated at M), is employed.

In the case or example of a purposely 30% overdevelopment of an indicated 271A minutes development above the regular or normal development time indicia i6; for instance, 27% minutes is placed opposite the left hand normal processin Y time indicating arrow i7a and the new or 30% overdevelopment processing time is directly read off of the indicia ll, just opposite the (left hand) 30% indicating indicia, namely the indicated processing time is to be increased from 27% minutes to 351/2 minutes approximately, as seen in the setting in FIG. l, for the particular developer contrast, class of nlm, etc. displayed. Example used and illustrated contrast desired: High contrast, Developer No. 2; Length of Film: 250 feet; Film Class: Class L; Developer Temperature: 70 F.; Processing Time: 27% minutes.

By simple manipulation of the computer the desired result is indicated.

Where it is desired to intentionally overdevelop, the developing time is set up opposite the normal processing time pointer 17a, as explained above. In the case of intentional underdevelopment the normal processing time in minutes (271A minutes) is set opposite the normal processing arrow 18a on the right hand side of the panel Il, and the desired or required reduced processing time in minutes; for instance, 30% underdevelopment is read directly oli the scale 16, namely 19 minutes approximately, instead ot 27% minutes.

The reverse side of my improved photographic processing calculator comprises a back panel of similar outline to the front panel ll, and the adjustable segment or quadrant 9 and large main disk l2 are both adjustable about the pivot 8 between the back and front panels 25 and 1.

The back panel 25 is employed for calculating the normal processing speed in feet per minute for lilm processing machines, known as the A9 processing machine, for the different developers and different contrast conditions in connection with dilerent classes of i'ilms, at diiierent temperatures, similar to those set forth aforesaid in connection with the indicia ll-lon the face of the main disk l2, segment and front panel 1.

ln addition, the rear panel is provided with cooperative indicia for determining the processing time in minutes for the distance which the film travels in the developer', for use with practically all automatic film processing machines.

HG. 2 discloses the rear panel and associated main dial and cooperating indicia in plan.

The main dial or disk l2 may be provided with the cooperating indicia on its rear face, or a separate disk may be provided, similar in shape, and size to the main disk l2 and pivoted on the pivot bearing S, between the rear or back panel 25 and the rear face of the main disk l2, this disk, or the rear face of the main disk l2, whichever is employed being shown in plan in FIG. 5 and denoted as 26.

rthe upper portion of the rear panel 25 is provided with an elongated rectangular window 25a for displaying the ditlerent developer and contrast conditions indicating indicia 27 on the disk or face 26.

immediately below the opening 25EL are three circumerentially spaced radial windows or slits 23, 29 and 3@ for displaying cooperating predetermined groups of rate of nlm movement in feet per minute radial columns ot indicia therethrough indicated at 3l?, 31h, and 31 on the face or disk 25, as seen in FIG. 5, each column for one of the diiferent types of developer and contrast conditions indicating indicia 27 tor one of the different classes of lms, 23 being the window employed with Class L ilms, column Ella, while the windows 29 and are employed respectively with Class N, and Class l. films, column 3th and 31C.

Adjacent the right hand edge or each of the windows 29 and El@ are radial temperature scale indicia 2S, and 30@ for determining the required variations in t per minute of the lm during processing for predetermined temperatures of the developers indicated on the edges of the windows 23, 29 and 3d, in cooperative register with the radially spaced columns of feet per minute indicating indicia Sla, 39 and 31C in the radial columns 3l, best seen in PIG. 5.

ln the rear panel 25, below the pivot d are two elongated concentric narrow arcuate window openings or slots 33 and 34 which are employed for computations in connection with Automatic Processing Machines generally. The shorter inner window 33 is disposed to expose a correlated arcuate scale 33a on the disk 26 graduated in feet per minute travel oi the film in the developer. The other longer concentric arcuate window 3d extends nearly to the opposite side edges of the panel 25 and has along its lower or outer edge the graduations Stia, correlated to the feet per minute scale 33a, for deternining the distance which the iilm travels in the developer as determined by the portion of the outer graduated circular scale 34th on the disk 26 which is exposed through the window 34, opposite the indicia 3ds.

Reference is being made to FlG. 2 particularly, for an example of the operation of the computer for A9 Processing Machine.

Example Developer to be used: Developer No. 2 Contrast desired: Medium contrast Film class: Class N Developer temperature: 70

Operating speed: 27/s feet per minute From the above it will be observed that by setting the disk to display the developer and contrast condition indicies 27 in the window 25a this positions the proper feet per minute indicating indicia columns in back of the three windows 28, 29 and 30.

Since the ilm employed is of Class N category the center window 29 is employed, and by noting the temperature of the developer indicating indicia 29ab (70) the operating speed (of 2% feet per minute) is directly indicated, as seen in FlG. 2.

Assuming a condition in connection with Automatic Processing Machines generally in which it is required to develop a particular ilm minutes and the film travels a distance of 60 feet in the developer and the correct operating speed in feet per minute is desired. As seen in FIG. 2 the dial or disk 26 is adjusted to dispose the processing time in minutes in the developer indicia 34h (namely 60 minutes) in the window 34 over the distance the lilm travels in developer indicia 34a around the edge of the window 34. Referring to the indicia 33@ now exposed through the window 33 it will be observed that the correct rate per minute travel of the lm or processing speed is directly indicated, namely in the example its one foot per minute.

The over-and-underdevelopment calculator 14 (FIG. l) can be used with the Automatic Processing Machine calculator (HG. 2 lower half of panel 215) by rst calculating the new processing time. lf the processing time in minutes was thirty minutes then by adjusting the smaller' disk (FlG. l) to dispose a normal processing time (of 39 minutes) opposite the left hand arrow 17a (for overdevelopment), or opposite the right hand arrow 18a for underdevelopment the adjusted development time can be read off ot the dial ld opposite the over-or-underdevelopment percentage; for instance, if 20% overdevelopment is required, the development time would be 36 minutes (instead of 30 minutes), Now by adjusting the dial 26 to dispose the processing time in minutes (36 minutes) opposite the distance the lm travels in the developer (scale 3401 FIG. 2) the desired rate of movement of the illrn in the developer per minute can be directly determined through the window 33 from the indicia scale 33? on the dial (FIG. 5).

As examples the Development Groups for various subjects are indicated below:

GROUP l--LOW CONTRAST DEVELOPMENT (USE ARMED FORCES DEVELOPER NO. 3):

l-ligh contrast ground subjects Portraits with contrast lighting Flashlight pictures of contrasting subjects Snow scenes in sunlight Contrasting low altitude obliques GROUP Z-MEDlUM CONTRAST DEVELOPMENT (USE Ai MED FORCES DEVELOPER NO. 2) Average ground camera work:

Copies of contrasty photographs Pictures of airplanes in the air Verticals up to 10,000 feet GROUP 3 l-llGH CONTRAST DEVELOPMENT (USE ARMED FORCES DEVELOPER NO. l):

Verticals above 10,000 feet Copies ot low-contrast photographs Black-and-white process work Group 2 subjects taken under condition of either overcast or haze Hi gh altitude obliques Obliques of low contrast 7 GROUP l-MAXllv/IUM CONTI-AST AND lviAXl- MUM ELM SPEED (USE ARMED FORCES DE- VELOPER NO. l): Aerial night photography Badly underexposed negatives Negative made under conditions or" both overcast and haze I claim:

l. A strip hlm development processing time indicating computer for continuous development processing machines comprising, a ilat rectangular front panel membe having a tlm footage length indicating scale across the front of a top edge portion thereof for indicating the length of the lilm to be processed, said panel member having a Wide segmental window therein below said scale, said panel member having a smaller developer and contrast condition indicia display window conccntrically formed therein relative to and below said Wide segmental Window, a flat opaque adjustable segmental indicia carrying member pivoted to the rear ot said panel member below said smaller developer and contrast condition indicia display window for closing said Wide segmental window, said segmental member having a wide window therein behind said developer and contrast condition indicating indicia display window for leaving said last mentioned indicia display window uncovered for all adjusted positions of said segmental member, said segmental member having a manipulating tab extending radially outward beyond the top edge of said front panel for swinging said segmental member to different adjusted positions behind said front panel for variations in the length of the lms to be processed, position indexing means on said segmental member disposed for selective registration with said footage length indicating scale for adjusting the segmental member to compensate for the length of the iilm to be developed, said segmental member having a radial window slit opening therein extending across the Wide segmental opening in the panel member, said segmental member having a plurality ot radially disposed groups of developer temperature indicating indicia thereon adjacent the edge of said radial slit opening for indicating concentric groups of similar predetermined variations of temperatures of lilm developers required for each or the said groups for film classes relating to each of said groups, said front panel member and said segmental member having a plurality of cooperating concentric arcuate pointer and class of lm indicator arrows thereon each leading to one of said groups of temperature indicating indicia for indicating predetermined temperatures of developers to be used with each of said different classes of films indicated, a circular processing time determining dislf` pivotally disposed behind said front panel and said segmental member concentric to the pivot of said segmental member and having a plurality of predetermined different developer and contrast condition indicating indicia thereon disposed concentrically around the pivot, for selective display through said smaller developer and contrast condition indicating indicia display window in said front panel member, said circular indicia carrying disk having a plurality of circumtercntially spaced groups or radially aligned columns of different developing time determining indicia for each of said developer and contrast condition indicia and variations in ilm footage length, indicating scale on said panel, disposed relative to each of said developer and contrast contrast condition indicating indicia to lie Within the connes of said Wide segmental Window in said front panel when a predetermined correlated developer and contrast condition indicia is displayed in said smaller developer and contrast condition indicia display Window, said radially aligned columns of indicia being disposed for predetermined selective display through said radial slit opening, in groups for predetermined registration with said cooperating pointer and class of r'llm indicator means, with the radially aligned columns of indicia in each group selectively displayed for predetermined registration in said 8 radial slit opposite predetermined temperature indicating indicia for each group, for indicating the processing time in each group for predetermined variations in developer tempeartures, classes of films, and developer and contrast conditions.

Z. A strip nlm development processing computer for continuous development processing machines comprising, a pair of iront and baci; rectangular pan-cl members, said front panel member having a film footage length indicating scale across the front ot the top edge thereof for i licating predetermined lengths of the 'tlm to be processed, said front panel member having a wide segmental Window therein below said scale, said iront panel member having a relatively smaller developer and contrast condition indicia display Window formed therein below said wide segmental window, an opaque adjustable segmental indicia carrying member pivoted at tde rear of Said iront panel member below said smaler developer and contrast condition indicia display Window for closing said Wide segmental Window, said segmental member having a Wide window therein behind said developer and contrast condition indicat ind ia display window for leaving said last mentioned indicia display Window uncovered for all adjusted positions of said segmental memcr, said segmental member having manipulating means for swinging said segmental member to different adjusted positions behind said Wide segmental window in said front panel member for variations in the lengths of the films to be processed, including position indicator means on said segmental member disposed for registration with said film footage length indicating scale for determining the adjusted position oi said segmental member corresponding to the length ot the tllm to be developed, said segmental member having a radial Window slit opening therein extending across the wide segmental opening in the front panel member, said segmental member having a plurality of radially disposed groups of developer temperature indicating indicia thereon adjacent the edge of said radial Window slit opening for indicating predetermined variations in temperatur-es for the groups for hlm classes relating to each group, class of nlm indicating means between said front panel member and said segmental member for selectively indicating the groups of temperature variation indicia for predetermined different classes of lilms, a circular processing time indicating indicia carrying disk member pivotally disposed behind said front panel member and said segmental member having a plurality ot predetermined dilerent developer and contrast condition determining indicia thereon spaced concentrically around the pivot, for selective display through said smaller developer and contrast condition indicating indicia display Window in said front panel member, said circular indicia carrying disk having a plurality of circumferentially spaced radial columns of groups of dirferent predetermined developing time determining indicia for each et said developer and contrast condition indicia and different iilm classes and variations i lm lengths indicated on the iilm footage length indicating scale, said radial columns disposed on said disk relative to each of said develope and contrast cond ion indie ting indicia to lie Within the coniines of said wide segmental window in said front panel member relative to the position of a correlated predetermined developer' and contrast condition indicia displayed in said smaller developer and contrast condition indicia display Window, said radial columns of indicia being disposed for predetermined selective display through said slit opening in said groups for predetermined registration with said temperature variation indicia for group for each class oi film, for indicating the processing time in each group for predetermined variations in developer temperature, classes of iilms, and developer and contrast conditions.

3. A strip film development processing computer comprising, a dat front panel having a footage scale along one edge comprising film length determining indicia, a main manually adjustable circular processing time indieating disk pivoted centrally behind the front panel and lfacing the same, said main disk having concentric groups 'of radially disposed columns of processing time indicating indicia thereon in each group, for predetermined different developers and different developer temperature conditions, each group having radial columns of developing time indicating indicia for predetermnied diiierent classes of lilms, the radial columns in each group being circumferentially spaced for predetermined relation to variations in footage length of the film indicated on the aforesaid footage scale, said main disk having a plurality of predetermined ditferent developer and contrast condition indicating indicia thereon, each disposed in predetermined relation to a plurality of the aforesaid radial columns in one of said groups for predetermined diierent contrast conditions in the film, said different developer and contrast indicating indicia disposed in predetermined concentric relation about the main disk pivot and said radial columns of processing time indicating indica, said front panel having a large Wide segmental window opening therethrough for displaying all of said radial columns in any group which are correlated to each of said developer and contrast condition indicating indicia on said main disk, said front panel having a second smaller segmental Window opening therein disposed in predetermined relation to the larger Window for simultaneously displaying therethrough one of said developer and contrast condition indicating indicia on the main disk which is related to the radial columns of processing time indicating indicia in a predetermined group displayed through said large Wide segmental Window, a plurality of iilm class indicating means on said front panel concentrically disposed relative to the main disk pivot and said groups of processing time indicating indicia for selectively indicating a predetermined one of said groups of said processing time indicating indicia to be used for each of a plurality of diiierent classes of films, and opaque segmental member disposed between the main disk and the rear face of said front panel having a pivotal axis coincident with the axis of the pivot of the main disk, for covering all but one of said radial columns of indicia disposed behind said large wide segmental Window during swinging adjustments of Said segmental member, said segmental member having actuating means thereon for adjusting the same behind said front panel having indexing means thereon disposed to register selectively with said ilm length determining indicia on said footage scale for adjusting and determining the position of said segment in back of said large Wide segmental Window in predetermined relation to said film length indicating indicia, said segmental member having a radial slit window opening therein extending in a direction between the segments pivotal axis and its position indexing means for simultaneously displaying therethrough a single radial column of said processing time indicating indicia in all of said concentric groups on said main disk through said large segmental window, whereby adjustment of said segment indicates the variations in processing time for lms of predetermined different footago lengths in all film classes at different developer temperatures, said segmental member having cooperating film class indicating means disposed for cooperating indicating relation with the said plural film class indication on the front panel for selectively indicating different film class indicating indicia groups displayed through said radial slit Window opening, and developer temperature indicating indicia disposed adjacent one edge of said slit opening for selecting predetermined related development time indicating indicia in each radial column in each group displayed through said slit opening for the temperature of the developer to be used.

4. A strip fil-m development processing computer as set forth in claim 3, including means for determining percentages of purposeful overdevelopment time, and percentages of purposeful underdevelopment time relative to the development time indicated through said slit opening,

a manually adjustable over-and-under-development time determining disk pivoted at its center to said front panel, said over-and-underdevelopment time determining disk being progressively graduated adjacent its peripheral edge comprising a scale of progressively increasing normal developing time indicating indicia similar to said normal processing time indicating indicia on said main disk, said front panel having an over development percentage indicating scale increasing along one side of said over-andunderdevelopment indicating disk from a first normal processing time index in the same direction as said last mentioned normal processing ltime indicating indicia on said over-and-underdevelopment time determining disk, for registration fwith said rst normal developing time indicating index -for determining percentages of predetermined overtime development when a normal development time indicating indicia selected from said main disk is disposed opposite said iirst normal porcessing time index, said front panel having an undcrdevelopment percentage scale indicating indicia increasing from a second normal processing time indicating index around the opposite side of said over-and-underdevelopment indicating disk in the opposite direction from the normal processing time indicating indicia on said over-and-underdevelopment indicating disk, for determining percentages of purposeful underdevelopment time on said normal processing time indicating indicia located opposite said underdevelopment percentage indicating indicia, when the normal processing time indicia selected from said main disk is disposed opposite the second normal processing time index.

5. A strip iilm development processing computer for automatic strip lm development processing machines comprising, a panel member having a developer and contrast condition indicating indicia display window therein and a plurality of elongated circumfercntially spaced radial window openings therein adjacent said first mentioned window for simultaneous display of a plurality of circumferentially spaced radial columns of iilm processing speed indicating indicia for predetermined different classes of t-lms at predetermined different developer temperatures, indicating means adjacent each radial window opening for indicating predetermined classes or" film and predetermined variations in developer temperatures for predetermined developer and contrast condition indicating indicia exposed through said developer and contrast condition indicating indicia display window, a main indicia carrying disk pivotally mounted behind said panel for rotative adjustment, said disk having radial columns of circumferentially spaced film processing speed indicating indicia thereon for registration with said radially disposed circumferentially spaced windows in said panel, for indicating predetermined different processing speeds for dilferent classes of films at predetermined different developer temperatures for dirlerent predetermined developer and contrast conditions, and a plurality of developer and contrast condition indicating indicia disposed on said disk in predetermined correlated relation to said radial columns of indicia for selective display through said developer and contrast condition indicia display win.- dows simultaneously with said predetermined processing speed indicating indicia relating thereto, for vdeveloper temperatures and class of film determining indicia displayed in said radial 'window openings, said panel member having -an elongated arcuate window opening therein concentric to the pivotal center of said main indicia carrying disk for display .therethrough of indicia on said main disk for indicating predetermined lengths of time the film is to be developed, said arcuate Window having predetermined indicia disposed adjacent one edge thereof graduated from left to right for indicating the distance in feet the iilm is to travel in the developer, said panel member having a second concentric arcuate Window therein having pointer means adjacent one edge for registration with a feet per minute operating speed indicating indicia indicating scale on said indicia carrying disk for indicating the correct operating speed in feet per minute for `the film, said main indicia carrying disk having a concentric ring of indicia thereon for display through said elongated arcuate Window for registration with said distance in feet the film travels indicating indicia, for indicating developing time, and a second correlated indicia on said main disk for predetermined display through said second concentric arcuate Window in said panel for registration with said feet per minute pointer indicia for indicating the correct processing speed per minute on said feet per minute indicia, for predetermined distances the film trav els in the developer for the length of time the film travels in the developer,

References Cited in the file of this patent UNlTED STATES PATENTS Chritton Mar. 14,

Free Aug. 11,

Henoch Ian. 9,

Squyer Sept. 19, Freeman Apr, 1,

Aubert Nov. 28,

FOREIGN PATENTS Italy Dec. 7, 

1. A STRIP FILM DEVELOPMENT PROCESSING TIME INDICATING COMPUTER FOR CONTINUOUS DEVELOPMENT PROCESSING MACHINES COMPRISING, A FLAT RECTANGULAR FRONT PANEL MEMBER HAVING A FILM FOOTAGE LENGTH INDICATING SCALE ACROSS THE FRONT OF A TOP EDGE PORTION THEREOF FOR INDICATING THE LENGTH OF THE FILM TO BE PROCESSED, SAID PANEL MEMBER HAVING A WIDE SEGMENTAL WINDOW THEREIN BELOW SAID SCALE, SAID PANEL MEMBER HAVING A SMALLER DEVELOPER AND CONTRAST CONDITION INDICIA DISPLAY WINDOW CONCENTRICALLY FORMED THEREIN RELATIVE TO AND BELOW SAID WIDE SEGMENTAL WINDOW, A FLAT OPAQUE ADJUSTABLE SEGMENTAL INDICIA CARRYING MEMBER PIVOTED TO THE REAR OF SAID PANEL MEMBER BELOW SAID SMALLER DEVELOPER AND CONTRAST CONDITION INDICIA DISPLAY WINDOW FOR CLOSING SAID WIDE SEGMENTAL WINDOW, SAID SEGMENTAL MEMBER HAVING A WIDE WINDOW THEREIN BEHIND SAID DEVELOPER AND CONTRAST CONDITION INDICATING INDICIA DISPLAY WINDOW FOR LEAVING SAID LAST MENTIONED INDICIA DISPLAY WINDOW UNCOVERED FOR ALL ADJUSTED POSITIONS OF SAID SEGMENTAL MEMBER, SAID SEGMENTAL MEMBER HAVING A MANIPULATING TAB EXTENDING RADIALLY OUTWARD BEYOND THE TOP EDGE OF SAID FRONT PANEL FOR SWINGING SAID SEGMENTAL MEMBER TO DIFFERENT ADJUSTED POSITIONS BEHIND SAID FRONT PANEL FOR VARIATIONS IN THE LENGTH OF THE FILMS TO BE PROCESSED, POSITION INDEXING MEANS ON SAID SEGMENTAL MEMBER DISPOSED FOR SELECTIVE REGISTRATION WITH SAID FOOTAGE LENGTH INDICATING SCALE FOR ADJUSTING THE SEGMENTAL MEMBER TO COMPENSATE FOR THE LENGTH OF THE FILM TO BE DEVELOPED, SAID SEGMENTAL MEMBER HAVING A RADIAL WINDOW SLIT OPENING THEREIN EXTENDING ACROSS THE WIDE SEGMENTAL OPENING IN THE PANEL MEMBER, SAID SEGMENTAL MEMBER HAVING A PLURALITY OF RADIALLY DISPOSED GROUPS OF DEVELOPER TEMPERATURE INDICATING INDICIA THEREON ADJACENT THE EDGE OF SAID RADIAL SLIT OPENING FOR INDICATING CONCENTRIC GROUPS OF SIMILAR PREDETERMINED VARIATIONS OF TEMPERATURES OF FILM DEVELOPERS REQUIRED FOR EACH OF THE SAID GROUPS FOR FILM CLASSES RELATING TO EACH OF SAID GROUPS, SAID FRONT PANEL MEMBER AND SAID SEGMENTAL MEMBER HAVING A PLURALITY OF COOPERATING CONCENTRIC ARCUATE POINTER AND CLASS OF FILM INDICATOR ARROWS THEREON EACH LEADING TO ONE OF SAID GROUPS OF TEMPERATURE INDICATING INDICIA FOR INDICATING PREDETERMINED TEMPERATURES OF DEVELOPERS TO BE USED WITH EACH OF SAID DIFFERENT CLASSES OF FILMS INDICATED, A CIRCULAR PROCESSING TIME DETERMINING DISK PIVOTALLY DISPOSED BEHIND SAID FRONT PANEL AND SAID SEGMENTAL MEMBER CONCENTRIC TO THE PIVOT OF SAID SEGMENTAL MEMBER AND HAVING A PLURALITY PREDETERMINED DIFFERENT DEVELOPER AND CONTRAST CONDITION INDICATING INDICIA THEREON DISPOSED CONCENTRICALLY AROUND THE PIVOT, FOR SELECTIVE DISPLAY THROUGH SAID SMALLER DEVELOPER AND CONTRAST CONDITION INDICATING INDICIA DISPLAY WINDOW IN SAID FRONT PANEL MEMBER, SAID CIRCULAR INDICIA CARRYING DISK HAVING A PLURALITY OF CIRCUMFERENTIALLY SPACED GROUPS OF RADIALLY ALIGNED COLUMNS OF DIFFERENT DEVELOPING TIME DETERMINING INDICIA FOR EACH OF SAID DEVELOPER AND CONTRAST CONDITION INDICIA AND VARIATIONS IN FILM FOOTAGE LENGTH, INDICATING SCALE ON SAID PANEL, DISPOSED RELATIVE TO EACH OF SAID DEVELOPER AND CONTRAST CONTRAST CONDITION INDICATING INDICIA TO LIE WITHIN THE CONFINES OF SAID WIDE SEGMENTAL WINDOW IN SAID FRONT PANEL WHEN A PREDETERMINED CORRELATED DEVELOPER AND CONTRAST CONDITION INDICIA IS DISPLAYED IN SAID SMALLER DEVELOPER AND CONTRAST CONDITION INDICIA DISPLAY WINDOW, SAID RADIALLY ALIGNED COLUMNS OF INDICIA BEING DISPOSED FOR PREDETERMINED SELECTIVE DISPLAY THROUGH SAID RADIAL SLIT OPENING, IN GROUPS FOR PREDETERMINED REGISTRATION WITH SAID COOPERATING POINTER AND CLASS OF FILM INDICATOR MEANS, WITH THE RADIALLY ALIGNED COLUMNS OF INDICIA IN EACH GROUP SELECTIVELY DISPLAYED FOR PREDETERMINED REGISTRATION IN SAID RADIAL SLIT OPPOSITE PREDETERMINED TEMPERATURE INDICATING INDICIA FOR EACH GROUP, FOR INDICATING THE PROCESSING TIME IN EACH GROUP FOR PREDETERMINED VARIATIONS IN DEVELOPER TEMPERATURES, CLASSES OF FILMS, AND DEVELOPER AND CONTRAST CONDITIONS. 